2010 Hyundai Genesis Coupe Rear Spoiler Install

Last updated on December 10th, 2018

It’s one thing to bolt or stick on accessories, but drilling into your trunk (or any other part of your car’s bodywork for that matter) is not for the faint of heart. This guide is pretty much aimed at giving anybody the confidence to drill their trunk in order to install a Genesis Coupe Rear Spoiler. The OEM, or non-OEM version. If you don’t have a Genesis, than it’s still probably a pretty decent starting point if their isn’t a specific spoiler install tutorial for your vehicle.

The stock drill locations will be used for the easiest install. I used the OEM drill template to locate the drill holes, which made the project extremely easy. Nonetheless, measurements are included so anybody with some measuring tape and a piece of string can locate the holes with the same precision.

As always, if you choose to follow this guide it’s under your own risk. My install came out perfect, but yours may vary depending on your access to tools or skill level.

Note – This guide is focused on the OEM Genesis Coupe Rear Spoiler installed on a 2010 Hyundai Genesis Coupe 2.0T Base Model. This DIY can also be used for the “OEM Style” spoiler using the hole location method located at the end.

Choosing a rear spoiler

Ebay is probably one of the best places to start the search for a Genesis Coupe rear spoiler. Just make sure to include “Worldwide” items.

If you haven’t purchased your spoiler yet, let me give you my opinion on the matter.

Like always, Ebay is the place to start looking for a Genesis Coupe rear spoiler. Basically, you have two options. And independent of where you buy it, the level of quality will be basically indistinguishable. Or at least impossible to distinguish in the listing. So don’t worry too much about it. I give you the thumbs up to simply price-shop .

The gist of it is that there are two spoilers. The “OEM” spoiler, and the “OEM style” spoiler. Let me just start out saying that for the difference in price, the “OEM” version directly from Hyundai is vastly superior in the small details, but once installed the difference is quite small and almost negligible. I know because I purchased both, but ended up selling the “OEM Style” after buying the “OEM”.

Comparison of the OEM vs OEM-Style Spoilers

The “OEM-Style” will cost you as low as 130$, whereas the “OEM” model will run you about 230$. At least as of 2015 when this guide was first written (Update: Currently the OEM version seems much harder to source and more expensive). Mind you, I’m talking about “shipped to your door” prices from Ebay. Truthfully, it’s where you’ll find the best prices. The difference in paint finish between either is virtually non-existent. They both have a very nice finish, with no defects worth mentioning. I’d even say the OEM-Style’s finish might be better than my stock paint.

The general shape of both is identical, as is the main mounting bolt locations. The OEM version, which is manufactured by Hyundai, does feel better built and heavier (in the high-quality type of way). But truthfully, from more than a few feet away, once installed it’s near impossible to distinguish them apart.

The brake light on both works the same, but the “OEM style” has to be soldered or connected manually to the stock brake light harness. Thankfully, that’s a trivial task. On the other hand the “OEM” version is “Plug and play”, with a connector already wired to it. Also, the brake light on the “OEM” version is slightly larger than the “OEM Style” if I remember right. But you can only tell if they are side by side. If not you’d never know.

Other differences

Besides the plug and play electrical plug of the “OEM” spoiler, the other thing that made me like it a lot more was that the OEM spoiler has a nice molded rubber gasket to seal the spoiler to the trunk. The “OEM Style” only has a very cheap, over-sized and more or less poorly cut piece of foam. It will also likely be slightly visible after installation. This alone justified the difference in price to me.

The final aspect would be that the “OEM” version is much easier and quicker to install by one person. Mainly because of the fact that it has “Guide rods” where it screws into the trunk. This way, a single person can align the spoiler with the trunk closed and drop the guide rods into the drilled holes. Then they can open the trunk with the guide rods keeping the spoiler in place and directly screw the bolts into the guide rods from the inside of the trunk with the trunk door in vertical position. Without those guide rods, you need two people to hold the spoiler exactly in place with the trunk door open while you screw in 4 bolts from the inside. Don’t worry, it sounds more complicated than it is.

Drill locations

As far as drill locations, both use the same drill locations for attaching the spoiler. However, the hole for the electrical connector of the third brake light is different. Though it is easily found knowing the position of the other two holes.

By the way, the reason I bought the OEM spoiler after buying the OEM Style was that the OEM-style includes no instructions whatsoever as to where to drill the holes. And I wasn’t about to drill into my trunk in the wrong place just to save 100 bucks. But, that is no longer an issue for you guys since in this DIY you will find the precise drill locations listed below.

Rear Spoiler Summary

Let me summarize that for you. If you want the absolute lowest price, then the “OEM Style” is fine. I’d say that the paint quality of both are virtually identical (although the mounting base may vary slightly). But if you have to install the spoiler on your own or with only one other person, want ease of install and a high quality finish, or basically just adore your car, buy the “OEM” spoiler. If you want to save money, save it on your girlfriend, not your ride .

In any case, buying the OEM spoiler directly from Hyundai with installation can easily be in the 700$ range, so installing it yourself for 250$ is a steal. For the extra 100$ it’s definitely worth it.

Update

After initially making this DIY I was made aware that some OEM-Style spoilers have a mounting base which doesn’t perfectly mate with the trunk bodywork, so nowadays I’m much more cautious about recommending it. I’d say only buy OEM-Style if you can’t find the OEM spoiler at a price you’d be willing to pay.

What You’ll Need

As far as tools, you will need the following. Items in parenthesis means desirable but not crucial.

Genesis Coupe Rear OEM Spoiler Install – Step-by-Step

Step 1 – Find the right spot

Find somewhere appropriate to work on your cars for a few hours.

Before starting, clean everything well, and if possible, apply wax.

Find a nice, spacious, horizontal place and set aside around about 5 hours.
Just in case, it should take much less though. For installing the OEM Spoiler you need between 1 and 2 extra pairs of hands to install. For the OEM version, you could do it alone but a friend definitely helps.

First let’s start by cleaning off any dust or dirt on the trunk and surroundings that could scratch the finish of the paint if we lean against it. Then, I definitely recommend applying 2 or 3 quick layers of wax. We will be applying, moving and removing tape so it helps reduce the amount of residue left over afterwards.

Step 2 – Remove the trunk lining

Remove the trunk’s interior lining. I have no pictures of this step since I already had it removed. But basically all that you need to do is pry off the black friction screws. A body panel pry tool (basically a plastic fork) helps, but it is not always necessary.

Be careful to keep all of the “screws“, since they will be reinstalled afterwards. Also, make sure to not scratch the paint underneath the black lining.

Step 3 – Install the Template

Play around with the Genesis Coupe’s rear spoiler OEM template until you’re sure you are putting it together right.

Apply the little adhesive strip that comes with the OEM rear spoiler.

You’ll want to line up the strip like this.

Here’s how it should look once installed. Apply some painters tape under the hole locations, if you have a chance.

Install the Genesis Coupe OEM rear spoiler template on the other side.

Here’s how it should look with both drill location templates installed.

Start by applying the OEM Drill template to the trunk door. First apply the small, thin, black strips lining it up with the bottom corner. It should be within 2mm of the trunk edge all around. Feel free to remove and reapply until you are happy with its position. If you waxed the trunk door, it will be a lot easier to reposition. Also, the strips are side-dependent, so make sure you’re applying the right strip to the right side.

After that, apply the large transparent template lined up with both the trunk edge and the edge of the applied strip. Once you start, applying the strips should be more or less intuitive. After applying the template to both sides, apply a strip of painter’s tape underneath the hole markings of the template. That will help keep you from scratching the finish with shavings while drilling. Plus, it can help stop the drill bit from sliding around when starting the hole.

Be careful! If you are installing a OEM-Style spoiler, the third hole on the left side is in a different position. Nonetheless it can easily found measuring off your spoiler and having located the two mounting holes.

Note: Please do not ask in the comments where to buy the OEM drilling template. It comes with the OEM spoiler, and is not available for sale separately.

Step 4 – Start drilling

DO NOT skip using a center punch. If the drill bit starts to dance or slips, you’re gonna be very pissed you ever decided to follow this DIY. Don’t say I didn’t warn you.

Make deep center punch marks, but don’t apply so much pressure as to “push in” the sheet metal

Pull out your drill.

Start drilling into the trunk. Don’t worry, it hurt me to do this, too.

Blow or brush away the chips. Don’t wipe.

Here are the drilled holes for the Genesis Coupe rear spoiler.

And on the right side.

The holes should more or less line up with the gaps in the inner body.

Remove the Genesis Coupe rear spoiler drill template, and use a center punch to mark all of the drill holes. Given how easy the drill bit could dance or slip, this should be considered non-negotiable.

There will be 3 holes on the left side and two holes on the right side (OEM Spoiler). Start by drilling a pilot hole of your choosing with any small-ish drill bit.

Step 5 – Drill to the correct size

Either a step drill or a hole saw really is the only good way to drill holes in sheet metal this big.

After that, decide how you are going to drill the actual holes. In my case I used a step drill bit, but either a drill bit of the correct size or a hole saw would work. Remember to use high quality bits, and operate at moderately high speeds drilling with confidence. Do not apply excessive pressure. The body panels are only a few millimeters thick and will bend if you press too much.

Note: Large drill bits should not be used to make holes in sheet metal – it creates triangular holes.

Step 6 – Deburr the holes

This is the deburring tool we’ll be using on the rear spoiler’s mounting holes.

You gotta love these nifty little deburring tools. Especially for the price.

If you just noticed you drilled in the wrong location, removing this piece of tape is going to hurt a lot more than a Brazilian wax job.

Seeing this is when you start to ask yourself if you just screwed up a perfectly good trunk hood.

Thankfully, the rear spoiler’s mounting holes came out perfect!

Now we have to deburr the Genesis Coupe rear spoiler holes. While a small file or even sandpaper can be used, proper deburring tools are dirt cheap on Ebay and will make your life a lot easier. Remember to use constant, light pressure and to deburr both the “outside” and “inside” of the hole.

After that, feel free to remove the tape and clean off any shavings. Be extra careful and blow or brush off shavings, but do not use a cloth since you will scratch the paint! Compressed air is the ideal solution. A recommendation for that professional touch would be applying some quick-dry scratch repair paint to the edges of the drill holes to avoid rust in the future.

Step 7 – Attach the rear spoiler

Those red metal rods at the top and bottom are the guide rods mentioned.

Here we can see the rear spoiler’s third Brake Light wire popping out of the hole.

We’re now one step closer to the finish line!

If you’ve gotten this far, the worst is over. You’ll be testing out the lights in less than 30 minutes in most cases. Either that, or very pissed off at drilling in the wrong place.

Now we have to place the spoiler in place. The OEM Spoiler is a lot easier to install thanks to its “guide rods”. You simply drop them into the drilled holes and screw into the spoiler from the inside. With the OEM-Style spoiler you have to hold the spoiler in place somehow while screwing in the 4 screws from the inside.

The first step is to run the electrical cable for the third brake light through the middle hole on the left side (in the case of the OEM style spoiler, the hole is behind the two mounting posts). After that, simply drop the guide rods in and screw in the bolts from the inside.

I would personally recommend applying a thick layer of wax to the gasket under the spoiler for a better seal. But it is by no means necessary. Apply thread locker (either Blue/Medium or Red/Strong) to the bolts before screwing the Genesis Coupe rear spoiler in. After all, you don’t want your new spoiler turning into the hood ornament of the unlucky guy driving behind you.

Step 8 – Route the third brake light cable

Once the Genesis Coupe rear spoiler is properly screwed in and secure, route the electrical cable through the trunk and attach with zip-ties.

Unplug the stock connector from the stock OEM third brake light, and plug it into the spoiler harness. If you bought the OEM Style spoiler, you will need to connect the cables yourself. Either crimping or soldering is fine, as long as it is done right – click the link to see the nuances between either method. It is only two cables, but polarity matters so make sure the brake light works before permanently attaching the electrical connector.

Finally, make sure that the trunk door properly opens and closes without damaging the electrical cable for the spoiler.

Step 9 – Test the brake light

If the spoiler’s brake light doesn’t light up, just switch the polarity of the wires.

Test the brake light. Hopefully it works. If not simply swap the polarity of the light.

Note: The extra weight of the spoiler makes the trunk door bang a lot harder. If you install the spoiler, I definitely recommend getting the OEM Strut for the Genesis Coupe w/ Spoiler. The part number is 817712M010.

Enjoy the Genesis Coupe rear spoiler!

If the third brake light works, great news, you’re done! Now take a nice ride to try it out.

You’re all done! Enjoy your Genesis Coupe rear spoiler! And if you’re interested to see what other projects I’ve been up to, take a peek here.

Extra – Measurements of Spoiler Drill Locations

The measurements here are for whoever doesn’t have the OEM template for the drill locations. Or for someone who purchased a OEM Style spoiler which does not include anything other than useless “drill hole locator tabs”. Which would be a very bad idea to use in a case like this where a OEM location exists. Especially with a multilayered unibody trunk door. To see the image in high-resolution, click here. While installing a Genesis Coupe rear spoiler without the template is more laborious, it’s still doable.

You will need metric measuring tape and a piece of string. Also consider applying painter’s tape to the approximate location of the drill holes. Or even taping a piece of paper. The way the markings get made on something other than the trunk door. As long as you measure with precision, this method is just as precise as using the OEM drill template. I still recommend purchasing a spoiler that includes the OEM drill template, but if you didn’t you’re still covered.

Take all measurements with respect to the upper left and right corners of the trunk door, where the sharpest angle is. Trace arches centered on those two points. Their intersection will precisely mark the drill hole locations. If you do it right, this is just as precise as the OEM template given that you could only be off by less than half an inch per some 3 or 4 feet. When I took the measurements, both sides agreed with each other within less than 3mm over more than a meter, which is pretty precise. You can trust that using this method you will nail the Genesis Coupe rear spoiler OEM drill spots. Your spoiler will be properly placed and centered.

Example

For example, to measure where the top left hole would be, you would take a section of string measuring exactly 30cm, with one point at the left top corner of the trunk door. With the other end of the string, you would hold a fine marker where the string ends (at the end of the 30cm), and trace an arch around the approximate position of the drill hole. Now you would have an arch centered at the left trunk door corner with a radius of 30cm.

Then you would take the string and measure 111.5cm centered at the right top corner of the trunk door. Next make another marking where the 111.5cm string intersects the 30cm arch traced before. The intersection of those two arches will precisely define the location of the drill hole. Now repeat for the remaining holes and you will have all of the drill locations. You’ll soon have the Genesis Coupe rear spoiler installed.

Please remember that the hole to pass the electrical connector for the spoiler light does vary between the OEM Spoiler and the OEM-Style spoiler.

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And who said millennials didn’t know how to get their hands dirty! I’m just a guy who doesn’t know when to quit, and is constantly in search of a solution to a problem that doesn’t exist yet. Check in to see my latest articles or projects.